3*r/4=15

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Solution for 3*r/4=15 equation: 



3r/4=15

We move all terms to the left:

3r/4-(15)=0

We multiply all the terms by the denominator


3r-15*4=0

We add all the numbers together, and all the variables

3r-60=0

We move all terms containing r to the left, all other terms to the right

3r=60

r=60/3

r=20

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